package com.zzh;

import java.util.Comparator;
import java.util.TreeSet;

public class TreeSetDemo {
    public static void main(String[] args) {
        int sum = sum(1, 2, 3, 4, 5);
        System.out.println(sum);
    }

    public static void test2() {

//        Comparator<Student> comparator = new Comparator<Student>() {
//            @Override
//            public int compare(Student o1, Student o2) {
//                return o1.getAge() - o2.getAge();
//            }
//        };
        Comparator<Student> comparator = (o1, o2) -> o1.getAge() - o2.getAge();

        TreeSet<Student> set = new TreeSet<>(comparator);

        set.add(new Student("张三", 20));
        set.add(new Student("李四", 18));
        set.add(new Student("王五", 22));
        set.add(new Student("赵六", 19));
        for (Student student : set) {
            System.out.println(student.getName() + "---" + student.getAge());
        }
    }

    public static void test1() {
        TreeSet<Student> set = new TreeSet<>();


        set.add(new Student("张三", 20));
        set.add(new Student("李四", 18));
        set.add(new Student("王五", 22));
        set.add(new Student("赵六", 19));
        for (Student student : set) {
            System.out.println(student.getName() + "---" + student.getAge());
        }
    }
    public static void test0() {
        TreeSet<Integer> set1 = new TreeSet<>();
        set1.add(5);
        set1.add(3);
        set1.add(4);
        set1.add(2);
        set1.add(1);
        for (Integer integer : set1){
            System.out.println(integer);
        }
//        System.out.println(set1);
    }

    public static int sum(int...a) {
        int total = 0;
        for (int i =0 ;i < a.length; i++){
            total  += a[i];
        }
        return total;
    }
}
